U.S. patent number 8,616,864 [Application Number 13/001,503] was granted by the patent office on 2013-12-31 for axial flow fan.
This patent grant is currently assigned to Sanyo Denki Co., Ltd.. The grantee listed for this patent is Naoya Inada, Masahiro Koike, Toshiyuki Nakamura. Invention is credited to Naoya Inada, Masahiro Koike, Toshiyuki Nakamura.
United States Patent |
8,616,864 |
Nakamura , et al. |
December 31, 2013 |
Axial flow fan
Abstract
An axial flow fan provided herein allows for a wide range of
selection for placement of the fan and wiring of the lead wires.
The axial flow fan includes a first lead wire engaging portion 17
configured to be engaged with a plurality of lead wires 15 such
that the lead wires are pulled out therefrom into an outer space OS
defined between a first flange 21 and a second flange 23 of a fan
housing 3, a second lead wire engaging portion 19 configured to be
engaged with the plurality of lead wires 15 such that the lead
wires, which have been engaged with the first lead wire engaging
portion 17 and pulled out therefrom into the outer space OS, are
then pulled out toward the other side in the axial direction where
the second flange 23 is positioned, and a third lead wire engaging
portion 27 configured to be engaged with the plurality of lead
wires 15 such that the lead wires, which have been engaged with the
first lead wire engaging portion 17 and pulled out therefrom into
the outer space OS, are then pulled out in the axial direction
toward one side where the first flange 21 is positioned. The third
lead wire engaging portion 27 is formed in the first flange 21 at a
given distance from the first lead wire engaging portion 17.
Inventors: |
Nakamura; Toshiyuki (Nagano,
JP), Koike; Masahiro (Nagano, JP), Inada;
Naoya (Nagano, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
Nakamura; Toshiyuki
Koike; Masahiro
Inada; Naoya |
Nagano
Nagano
Nagano |
N/A
N/A
N/A |
JP
JP
JP |
|
|
Assignee: |
Sanyo Denki Co., Ltd. (Tokyo,
JP)
|
Family
ID: |
41444406 |
Appl.
No.: |
13/001,503 |
Filed: |
June 15, 2009 |
PCT
Filed: |
June 15, 2009 |
PCT No.: |
PCT/JP2009/060903 |
371(c)(1),(2),(4) Date: |
December 27, 2010 |
PCT
Pub. No.: |
WO2009/157338 |
PCT
Pub. Date: |
December 30, 2009 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20110097226 A1 |
Apr 28, 2011 |
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Foreign Application Priority Data
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Jun 26, 2008 [JP] |
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2008-167032 |
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Current U.S.
Class: |
417/423.14;
174/97 |
Current CPC
Class: |
F04D
25/0693 (20130101); F04D 25/08 (20130101); F04D
29/52 (20130101); F04D 25/0613 (20130101) |
Current International
Class: |
F04B
35/04 (20060101) |
Field of
Search: |
;417/423.14
;415/213.1,214.1 ;174/97 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2886153 |
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Apr 2007 |
|
CN |
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11-072098 |
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Mar 1999 |
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JP |
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2000-64987 |
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Mar 2000 |
|
JP |
|
2007-309313 |
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Nov 2007 |
|
JP |
|
Other References
Chinese Office Action with English Summary Translation, dated May
24, 2013, 8 pages. cited by applicant.
|
Primary Examiner: Kramer; Devon
Assistant Examiner: Herrmann; Joseph
Attorney, Agent or Firm: Rankin, Hill & Clark LLP
Claims
The invention claimed is:
1. An axial flow fan comprising: a fan housing including a first
flange positioned on one side of a rotary shaft in an axial
direction of the rotary shaft; a second flange positioned on the
other side of the rotary shaft in the axial direction; and a
cylindrical portion provided between the first flange and the
second flange, the fan housing having an air channel defined by an
inner space formed by the first flange, the second flange and the
cylindrical portion, the air channel having a suction port and a
discharge port; an impeller disposed in the air channel and
including a plurality of blades; a motor including: a power supply
circuit; a rotor to which the impeller is fixed, configured to
rotated about the rotary shaft; and, a stator provided with respect
to the rotor; a motor casing for receiving the motor therein,
including a bottom wall portion located within the first flange,
and a peripheral wall portion formed continuous with the bottom
wall portion and extending toward the second flange; a plurality of
webs disposed at intervals in a direction of rotation of the
impeller and located within the air channel to connect the motor
casing and the first flange, wherein a groove portion is formed in
one of the webs to allow an internal space of the motor casing to
communicate with an outer space defined between the first flange
and the second flange of the fan housing and located outside of the
cylindrical portion of the fan housing; a plurality of lead wires
received in the groove portion formed in the one of the webs,
connected to the power supply circuit of the motor, and extending
toward the outer space; a first lead wire engaging portion formed
in a connecting portion between the first flange and the one of the
webs, the first lead wire engaging portion engaged with the
plurality of lead wires such that the lead wires are pulled out
from and extend through the first lead wire engaging portion into
the outer space; a second lead wire engaging portion formed in the
second flange to be engaged with the plurality of lead wires such
that the plurality of lead wires, which have been engaged with the
first lead wire engaging portion and pulled out therefrom into the
outer space, are then pulled out toward the other side of the
rotary shaft in the axial direction where the second flange is
positioned; and a third lead wire engaging portion formed in the
first flange at a given distance from the first lead wire engaging
portion to be engaged with the plurality of lead wires such that
the lead wires, which have been pulled out from the first lead wire
engaging portion into the outer space, are then pulled out toward
the one side of the rotary shaft in the axial direction where the
first flange is positioned, wherein: the first lead wire engaging
portion is constituted from a first through-hole formed in the
first flange to pass therethrough in the axial direction and
communicating with the groove portion of the one of the webs, and a
first slit formed in the first flange to communicate with the first
through-hole, passing through the first flange in the axial
direction, and opened in an outer peripheral surface of the first
flange; the second lead wire engaging portion is constituted from a
second through-hole formed in the second flange to pass
therethrough in the axial direction, and a second slit formed in
the second flange to communicate with the second through-hole,
passing through the second flange, and opened in an outer
peripheral surface of the second flange; the third lead wire
engaging portion is constituted from a third through-hole formed in
the first flange to pass therethrough in the axial direction, and a
third slit formed in the first flange to communicate with the third
through-hole, passing through the first flange, and opened in the
outer peripheral surface of the first flange; the first slit is
dimensioned so that the plurality of lead wires engaged with the
first lead wire engaging portion and passing through the first
through-hole may not readily come off from the first slit; the
second slit is dimensioned so that the plurality of lead wires
engaged with the second lead wire engaging portion and passing
through the second through-hole may not readily come off from the
second slit; and the third slit is dimensioned so that the
plurality of lead wires engaged with the third lead wire engaging
portion and passing through the third through-hole may not readily
come off from the third slit.
2. The axial flow fan according to claim 1, wherein the second lead
wire engaging portion formed in the second flange and the third
lead wire engaging portion formed in the first flange face each
other in the axial direction.
3. The axial flow fan according to claim 1, wherein: the first
flange and the second flange each has a substantially quadrangular
outline shape as seen in the axial direction; and the first lead
wire engaging portion and the third lead wire engaging portion are
formed in one side of the quadrangular outline of the first flange;
and the second lead wire engaging portion is formed in one side of
the second flange, opposed to the one side of the quadrangular
outline of the first flange where the first and the third lead wire
engaging portions are formed.
Description
TECHNICAL FIELD
The present invention relates to an axial flow fan typically used
to cool the inside of an electric apparatus.
BACKGROUND ART
Japanese Patent Application Publication No. 2007-309313
(JP2007-309313A, FIG. 1) discloses an axial flow fan which includes
a fan housing including a first flange formed on one side in the
axial direction of the axial flow fan where a discharge port is
positioned, a second flange formed on the other side in the axial
direction where a suction port is positioned, and a cylindrical
portion formed between the first flange and the second flange. A
first lead wire engaging portion is formed in the first flange to
be engaged with a plurality of lead wires such that the lead wires
are pulled out therefrom into an outer space defined between the
first flange and the second flange. A second lead wire engaging
portion is formed in the second flange to be engaged with the
plurality of lead wires, which have been pulled out into the outer
space, such that they are then pulled out toward the suction
port.
DISCLOSURE OF THE INVENTION
Technical Problem
In the conventional axial flow fan mentioned above, the plurality
of lead wires are pulled out in the axial direction toward the
suction port. With such configuration, if it is difficult to pull
out the lead wires toward the suction port due to the placement of
the axial flow fan, for example, when the lead wires need to be
pulled out toward the discharge port in the axial direction of the
axial flow fan, wiring of the lead wires becomes complicated. In
the conventional axial flow fan, lead wires pulled out toward the
suction port may be in contact with an impeller, or lead wires
pulled around a long way toward the suction port may be blown by
the wind, thereby causing noise.
An object of the present invention is to provide an axial flow fan
in which lead wires may be pulled out toward either side of the fan
where a suction port is positioned or a discharge port is
positioned.
Another object of the present invention is to provide an axial flow
fan capable of reducing noise.
Still another object of the present invention is to provide an
axial flow fan in which lead wires may securely be pulled into a
space outside the fan even if a plurality of axial flow fans are
used.
Solution to Problem
An axial flow fan according to the present invention includes a fan
housing, an impeller, a motor including a rotor and a stator, a
motor casing, a plurality of webs in one of which a groove portion
is formed, a plurality of lead wires, a first lead wire engaging
portion, and a second lead wire engaging portion. The fan housing
includes a first flange positioned on one side of a rotary shaft in
an axial direction of the rotary shaft, a second flange positioned
on the other side of the rotary shaft in the axial direction, and a
cylindrical portion provided between the first flange and the
second flange. The fan housing has an air channel defined by an
inner space formed by the first flange, the second flange and the
cylindrical portion, and the air channel has a suction port and a
discharge port.
The impeller is disposed in the air channel and has a plurality of
blades. The rotor to which the impeller is fixed rotates about the
rotary shaft, and a stator is provided with respect to the rotor.
The motor is configured to rotate the rotor and is received in a
motor casing. The motor casing includes a bottom wall portion
located within the first flange and a peripheral wall portion
formed continuous with the bottom wall portion and extending toward
the second flange.
The plurality of webs are disposed at intervals in a direction of
rotation of the impeller and located within the air channel to
connect the motor casing and the first flange. The groove portion
is formed in one of the webs to allow an internal space of the
motor casing to communicate with an outer space of the fan housing.
The plurality of lead wires are received in the groove portion that
is formed in the one of the webs and connected to a power supply
circuit of the motor, and extend toward the outer space of the fan
housing.
The first lead wire engaging portion is formed in a connecting
portion between the first flange and the one of the webs to be
engaged with the plurality of lead wires such that the lead wires
are pulled out from the first lead wire engaging portion into an
outer space defined between the first flange and the second flange
of the fan housing and located outside the cylindrical portion of
the fan housing. The second lead wire engaging portion is formed in
the second flange to be engaged with the plurality of lead wires
such that the plurality of lead wires, which have been engaged with
the first lead wire engaging portion and pulled out therefrom into
the outer space, are then pulled out toward the other side of the
rotary shaft in the axial direction where the second flange is
positioned.
A third lead wire engaging portion is formed in the first flange at
a given distance from the first lead wire engaging portion to be
engaged with the plurality of lead wires such that the lead wires,
which have been pulled out from the first lead wire engaging
portion into the outer space, are then pulled out toward the one
side in the axial direction where the first flange is positioned.
In this manner, when the third lead wire engaging portion is
provided in the first flange at a given distance from the first
lead wire engaging portion with respect to the second lead wire
engaging portion provided in the second flange, the lead wires may
be pulled out not only toward the side where the second flange is
provided but also toward the side where the first flange is
provided. Namely, according to the present invention, the lead
wires may be pulled toward either side in the axial direction.
Also, a plurality of lead wires may be divided and separately
pulled out toward both sides in the axial direction. Thus, the
axial flow fan according to the present invention allows for a
wider range of selection for placement of the axial flow fan and
pulling out or wiring direction of the lead wires. Further, owing
to the third lead wire engaging portion, base portions of the
pulled-out lead wires may firmly be secured when the plurality of
lead wires are pulled out toward one side in the axial direction.
Thus the lead wires may be prevented from being wound into the
impeller when they come into contact with the impeller. Also, noise
may be prevented from being generated due to the existence of the
lead wired on the other side in the axial direction.
The second lead wire engaging portion formed in the second flange
and the third lead wire engaging portion formed in the first flange
may face each other in the axial direction. When the second and
third lead wire engaging portions are formed in positions where
they face each other in the axial direction, multiple axial flow
fans of the same shape may be used by arranging the axial flow fans
in the axial direction such that the second lead wire engaging
portion provided on one of adjoining two axial flow fans may be
adjacent to the third lead wire engaging portion provided on the
other axial flow fan. As a result, when two axial flow fans are
used by arranging them in the axial direction such that one side of
one of the two axial flow fans where the second lead wire engaging
portion is formed is in contact with one side of the other axial
flow fan where the first lead wire engaging portion is formed, the
lead wires engaged with the second lead wire engaging portion of
one of the axial flow fan may be engaged with the third lead wire
engaging portion and the second lead wire engaging portion of the
other axial flow fan adjacent to the one axial flow fan. As a
result, the lead wires of the one axial flow fan may be pulled out
in the axial direction toward the side where the second lead wire
engaging portion of the other axial flow fan is positioned through
the third and second lead wire engaging portions of the other axial
flow fan. Namely, even when a plurality of axial flow fans of the
same shape are used by arranging them in the axial direction, the
lead wires may securely be pulled out in the axial direction into a
space outside the fan, regardless of whichever side the first and
second lead wire engaging portions are formed on.
Preferably, the first flange and the second flange may have a
substantially quadrangular outline shape as seen in the axial
direction. Also preferably, the first lead wire engaging portion
and the third lead wire engaging portion may be formed in one side
of the quadrangular outline of the first flange while the second
lead wire engaging portion be formed in one side of the
quadrangular outline of the second flange, opposed to the side of
the first flange where the first and the third lead wire engaging
portions are formed. With such configuration, the third lead wire
engaging portion is disposed in the vicinity of the first lead wire
engaging portion. Accordingly, the lead wires need not be longer
than necessary when the lead wire is to be pulled out in the axial
direction toward a side where the first lead wire engaging portion
is formed. Further, when the second lead wire engaging portion is
located adjacent to the third lead wire engaging portion in the
axial direction under the above-discussed condition, the lead wires
need not be longer than necessary when multiple axial flow fans of
the same shape are used by arranging them in the axial direction as
mentioned above.
The first lead wire engaging portion may be constituted from a
first through-hole formed in the first flange to pass therethrough
in the axial direction and communicating with the groove portion of
the one of the webs, and a first slit formed in the first flange to
communicate with the first through-hole, passing through the first
flange in the axial direction, and opened to an outer peripheral
surface of the first flange. The second lead dire engaging portion
may be constituted from a second through-hole formed in the second
flange to pass therethrough in the axial direction, and a second
slit formed in the second flange to communicate with the second
through-hole, passing through the second flange in the axial
direction, and opened in an outer peripheral surface of the second
flange. The third lead wire engaging portion may be constituted
from a third through-hole formed in the first flange to pass
therethrough in the axial direction, and a third slit formed in the
first flange to communicate with the third through-hole, passing
through the first flange in the axial direction, and opened to the
outer peripheral surface of the first flange.
The first slit may be dimensioned so that the plurality of lead
wires engaged with the first lead wire engaging portion and passing
through the first through-hole may not readily come off from the
first slit. The second slit may be dimensioned so that the
plurality of lead wires engaged with the second lead wire engaging
portion and passing through the second through-hole may not readily
come off from the second slit. The third slit may be dimensioned so
that the plurality of lead wires engaged with the third lead wire
engaging portion and passing through the third through-hole may not
readily come off from the third slit. When the first to third lead
wire engaging portions are configured in this manner, a plurality
of lead wires may be engaged with the first to third lead wire
engaging portions merely by inserting the plurality of lead wires
through the first to third slits into the first to third
through-holes respectively. Thus engagement of the plurality of
lead wires is simplified. Further, once the lead wires have been
engaged with the engaging portions, that is, the lead wires have
been inserted within the first to third through-holes, the lead
wires may securely be engaged with the first to third lead wire
engaging portions since the lead wires do not readily come off from
the first to third slits.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of an axial flow fan according to an
embodiment of the present invention, as viewed from the front of
the fan.
FIG. 2 is the same view same as FIG. 1 except that lead wires are
omitted.
FIG. 3(A) is a front view of the axial flow fan of FIG. 2, and FIG.
3(B) is a partially enlarged view of FIG. 3(A).
FIG. 4(A) is a right side view of FIG. 3(A), and FIG. 4(B) is a
partially enlarged view of FIG. 4(A).
FIG. 5(A) is a rear view of FIG. 3(A), and FIG. 5(B) is a partially
enlarged view of FIG. 5(A).
FIG. 6 illustrates engagement of a plurality of lead wires in an
axial flow fan according to the embodiment of the present
invention. FIG. 6(A) is a perspective view of the axial flow fan as
viewed from the front of the fan, and FIG. 6(B) is a perspective
view of FIG. 6(A) as viewed from the rear of the fan.
FIG. 7 illustrates engagement of the plurality of lead wires in an
axial flow fan according to another example of the present
invention. FIG. 7(A) is a perspective view of the axial flow fan as
viewed from the front of the fan, and FIG. 7(B) is a perspective
view of FIG. 7(A) as viewed from the rear of the fan.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of an axial flow fan according to the present
invention will be described in detail below with reference to the
drawings.
FIG. 1 is a perspective front view of an axial flow fan according
to an embodiment of the present invention. FIG. 2 is the same view
of FIG. 1 except that lead wires are omitted. FIG. 3(A) is a font
view of the axial flow fan of FIG. 2, and FIG. 3(B) is a partially
enlarged view of FIG. 3(A). FIG. 4(A) is a right side view of FIG.
3(A), and FIG. 4(B) is a partially enlarged view of FIG. 4(A). FIG.
5(A) is a rear view of FIG. 3(A), and FIG. 5(B) is a partially
enlarged view of FIG. 5(A). In these views, reference numeral 1
denotes an axial flow fan. The axial flow fan 1 includes a fan
housing 3, an impeller 5, a motor (not illustrated), including a
rotor 7 and a stator (not illustrated), a motor casing 9, a
plurality of webs 11 (four webs 11a to 11d), a groove portion 13, a
plurality of lead wires 15, a first lead wire engaging portion 17,
and a second lead wire engaging portion 19.
The fan housing 3 includes a first flange 21, a second flange 23,
and a cylindrical portion 25. The first flange 21 is formed in an
annular shape, provided on one side in an axial direction of a
not-illustrated rotary shaft of the axial flow fan, that is, on a
side where an after-mentioned discharge port is positioned. As
shown in FIG. 2 and FIG. 3A, the first flange 21 has a
substantially quadrangular outline shape as seen in the axial
direction, that is, as viewed from the front of the axial flow fan
1. The first flange 21 has an approximately circular discharge
opening 22 that defines a discharge port of the axial flow fan 1.
The first flange 21 includes four flat surfaces 21a on the four
corner portions thereof, each having a through-hole 21b through
which a fixing screw, not illustrated, is threaded.
The second flange 23 is formed in an annular shape on the other
side in the axial direction, that is, a side where an
after-mentioned suction port is positioned. According to the
present embodiment, a taper portion 21c is formed to slope down to
the cylindrical portion 25 in a portion of the first flange 21
where an air channel 25 is defined. Eight stationary blades 21d are
formed in the taper portion 21c at given intervals in a direction
of rotation of the impeller. The second flange 23 has a
substantially quadrangular outline shape as seen in the axial
direction of FIG. 5A, that is, as viewed from the rear of the axial
flow fan 1. The second flange 23 has an approximately circular
suction opening 24 that defines a suction port of the axial flow
fan 1. The second flange 23 also includes four flat surfaces 23a on
the four corner portions thereof, each having a through-hole 23b
through which a not-illustrated fixing screw is threaded.
The cylindrical portion 25 is provided between the first flange 21
and the second flange 23. According to the present embodiment, the
fan housing 3 has an air channel 26 defined by an inner space IS
formed by the first flange 21, the second flange 23 and the
cylindrical portion 25. The air channel 26 has a suction port or
the suction opening 24 and a discharge port or the discharge
opening 22.
In the present embodiment, a side where the first flange 2 of the
fan housing 3 is positioned defines a side where the discharge port
or the discharge opening 22 of the axial flow fan 1 is positioned.
A side where the second flange 23 of the fan housing 3 is
positioned defines a side where the suction port or the suction
opening 24 of the axial flow fan 1 is positioned. However,
positioning of the suction port or the suction opening 24 and a
discharge port or the discharge opening 22 are not limited to the
configuration of the present embodiment. A side where the first
flange is positioned may define a side where the suction port or
the suction opening 24 of the axial flow fan 1 is positioned. A
side where the second flange is positioned may define a side where
the discharge port or the discharge opening 22 of the axial flow
fan 1 is positioned.
The impeller 5 including a plurality of blades 6 is disposed inside
the air channel 26. The impeller 5 is fixed to the rotor 7 operable
to rotate about the rotary shaft, not illustrated. The impeller 5
is rotated inside the air channel 26 by the rotation of the rotor 7
driven by a not-illustrated motor. According to the present
embodiment, a not-illustrated stator is provided with respect to
the rotor 7. The not-illustrated motor is received inside a motor
casing 9 which includes a bottom wall portion 9a located within the
first flange 21 and a peripheral wall portion 9b that is formed
continuous with the bottom wall portion 9a and extend toward the
suction port or the suction opening 24.
As shown in FIGS. 1 to 3, the plurality of webs 11 are constituted
from four webs 11a to 11d. The four webs 11a to 11d are disposed
within the air channel 26 at intervals in the direction of rotation
of the impeller 5 so as to connect the motor casing 9 and the first
flange 21. One of the four webs 11a to 11d, that is, the web 11d,
has a groove portion 13 formed therein. The groove portion 13
communicates with an internal space of the motor casing 9 and also
with an outer space of the fan housing 3. The groove portion 13
provided in the web 11d receives a plurality of lead wires 15,
which are connected to a power supply circuit of the
not-illustrated motor and extend toward an outers space of the fan
housing 3. Refer to FIG. 1.
A first lead wire engaging portion 17 is formed in a connecting
portion 21e between the first flange 21 and the web 11d. The first
lead wire engaging portion 27 is configured to allow the plurality
of lead wires 15 to be engaged therewith and pulled out therefrom
to an outer space OS defined between the first flange 21 and the
second flange 23 of the fan housing 3. The second lead wire
engaging portion 19 is formed in the second flange 23 and
configured to allow the plurality of lead wires 15, which have been
engaged with the first lead wire engaging portion 17 and pulled out
into the outer space OS, to be engaged with the second lead wire
engaging portion 19 and then pulled out toward the other side in
the axial direction where the second flange 23 is positioned, that
is, a side where the suction port is positioned.
The axial flow fan 1 according to the present embodiment further
includes a third lead wire engaging portion 27 in addition to the
first and second lead wire engaging portions 17 and 19. The third
lead wire engaging portion 27 is configured to allow the plurality
of lead wires 15, which have been engaged with the first lead wire
engaging portion 17 and pulled out to the outer space OS, to be
engaged with the third lead wire engaging portion 27 and then
pulled out therefrom in the axial direction toward the one side
where the first flange 21 is positioned, that is, a side where the
discharge port is positioned. As shown in FIGS. 1 to 3, the third
lead wire engaging portion 27 is formed in the first flange 21 at a
given distance from the first lead wire engaging portion 17. The
distance between the first lead wire engaging portion 17 and the
third lead wire engaging portion 27 may arbitrarily be
determined.
Accordingly, when the third lead wire engaging portion 27 is formed
in addition to the first and second lead wire engaging portions 17
and 19, it becomes possible to pull out the plurality of lead wires
15 not only toward the side where the second flange 23 is
positioned, that is, the side in the axial direction of the fan
where the suction port is positioned but also toward the side where
the first flange 21 is positioned, that is, the side in the axial
direction of the fan where the discharge port is positioned. This
allows for a wide range of selection for placement of the axial
flow fan 1 and wiring of the lead wires 15. In addition, the
presence of the third lead wire engaging portion 27 makes it
possible to pull out the plurality of lead wires 15 toward the side
in the axial direction where the discharge port or the discharge
opening 22 is positioned. Thus, it may become possible to solve
conventional issues, such as involvement of the lead wires 15 into
the impeller 5 due to the presence of the lead wires 15 pulled out
in the axial direction to the side where the suction port or the
suction opening 24 is positioned, and noise caused by the presence
of lead wires 15 on the side where the suction port or the suction
opening 24 is positioned.
In particular according to the present embodiment, as shown in
FIGS. 1, 2 and 4, the second lead wire engaging portion 19 is
formed in the second flange 23 and the third lead wire engaging
portion 27 is formed in the first flange 21 to face each other in
the axial direction. When the second lead wire engaging portion 19
and the third lead wire engaging portion 27 face each other in the
axial direction, the following effects may be obtained when two
axial flow fans of the same shape are used by arranging them in the
axial direction. Here, one of the axial flow fans is designated at
1 and the other axial flow fan is designated at 1'. Those
components of the other axial flow fan 1' which are common to those
of the axial flow fan 1 are designated with the same reference
numerals suffixed by an apostrophe ('). When the two axial flow
fans 1 and 1' are used by arranging them in the axial direction
such that the second flange 23 of the one axial flow fan 1 and the
first flange 21' of the other axial flow fan 1' are adjacent to
each other, the second lead wire engaging portion 19 formed on the
side where the suction port or the suction opening 24 of the axial
flow fan 1 is positioned and the third lead wire engaging portion
27' formed on the side where the discharge port or the discharge
opening 22' of the other axial flow fan 1' is positioned are
adjacent to each other in the axial direction.
As a result, the plurality of lead wires 15, which are engaged with
the second lead wire engaging portion 19 provided on the side of
the suction port of the axial flow fan 1, may be engaged with the
third lead wire engaging portion 27' provided on the side of the
discharge port of the other axial flow fan 1' adjacent to the one
axial flow fan 1 and also engaged with the second lead wire
engaging portion 19' provided on the side of the suction port of
the axial flow fan 1'. Accordingly, the plurality of lead wires 15
of the axial flow fan 1 may be pulled out in the axial direction
toward the side of the suction port or the suction opening 24' of
the other axial flow fan 1' through the third and the second lead
wire engaging portions 27' and 19' of the other axial flow fan 1'.
Refer to FIG. 6. Alternatively, the plurality of lead wires 15',
which are engaged with the third lead wire engaging portion 27' on
the side of the discharge port of the other axial flow fan 1' may
be engaged with the second lead wire engaging portion 19 provided
on the side of the suction port of the axial flow fan 1 adjacent to
the discharge port of the other axial flow fan 1', and engaged with
the third lead wire engaging portion 27 provided on the side of the
discharge port. Accordingly, the plurality of lead wires 15' of the
other axial flow fan 1' may be pulled out in the axial direction
toward the side of the discharge port or the discharge opening 22
of the axial flow fan 1 through the second and third lead wire
engaging portions 19 and 27 of the axial flow fan 1. Refer to FIG.
7. As a result, even when two or more axial flow fans 1 and 1' of
the same shape are used by arranging them in the axial direction,
the plurality of lead wires 15 may securely be pulled out on either
side of the axial direction toward a space outside the suction port
or toward a space outside the discharge port.
As discussed above, the first flange 21 and the second flange 23
has a substantially quadrangular outline shape as seen in the axial
direction. According to the present embodiment, the first and the
third lead wire engaging portions 17 and 27 are formed in one side
S1 of the quadrangular outline of the first flange 21. Refer to
FIG. 3. The second lead wire engaging portion 19 is formed in one
side S2 of the quadrangular outline of the second flange 23,
opposed to the side S1 where the first and the third lead wire
engaging portions 17 and 27 are formed. Refer to FIG. 5. With such
configuration, the third lead wire engaging portion 27 may be
provided in the same side S1 of the first flange 21 in the vicinity
of the first lead wire engaging portion 17. Thus the lead wire 15
need not be longer than necessary even when the lead wire 15 is to
be pulled out in the axial direction toward a side where the
discharge port is positioned. Further, since the second lead wire
engaging portion 19 and the third lead wire engaging portion 27 are
arranged along the axial direction, the lead wire 15 need not be
longer than necessary even when a plurality of axial flow fans of
the same shape are used by arranging them in the axial
direction.
According to the present embodiment, the first lead wire engaging
portion 17 may be constituted from a first through-hole 17a that is
formed in the first flange 21 to pass therethrough in the axial
direction and to communicate with the groove portion 13 of the web
11d, and a first slit 17b that is formed in the first flange 21 to
communicate with the first through-hole 17a, passing through the
first flange 21 in the axial direction, and opened in an outer
peripheral surface 21f of the first flange 21. Refer to FIGS. 3(B)
and 4. The second lead wire engaging portion 19 may be constituted
from a second through-hole 19a that is formed in the second flange
23 to pass therethrough in the axial direction, and a second slit
19b that is formed in the second flange to communicate with the
second through-hole 19a, passing through the second flange 23 in
the axial direction, and opened to an outer peripheral surface 23c
of the second flange 23. Refer to FIGS. 4(B) and 5(B). The third
lead wire engaging portion 27 may be constituted from a third
through-hole 27a, which is formed in a portion 21g of the first
flange 21 that is opposed in the axial direction to the second lead
wire engaging portion 19 provided in the second flange 23 and
passes through the first flange 21 in the axial direction, and a
third slit 27b formed in the first flange 21 to communicate with
the third though-hole 27a, passing through the first flange 21 in
the axial direction, and opened to an outer peripheral surface 21f
of the first flange 21. Refer to FIGS. 3(B) and 4(B).
The first slit 17b may be dimensioned so that the plurality of lead
wires 15 engaged with the first lead wire engaging portion 17 and
passing through the first through-hole 17a may not readily come off
from the first slit 17b. The second slit 19b may be dimensioned so
that the plurality of lead wires 15 engaged with the second lead
wire engaging portion 19 and passing through the second
through-hole 19a may not readily come off form the second slit 19b.
The third slit 27b may be dimensioned so that the plurality of lead
wires 15 engaged with the third lead wire engaging portion 27 and
passing through the third through-hole 27a may not readily come off
from the third slit 27b.
More specifically, in the first lead wire engaging portion 17, the
first through-hole 17a is a trapezoidal hole as viewed from the
side where the first flange 21 is positioned, that is, as viewed
from the front of the axial flow fan 1, passing in the axial
direction through the portion 21e of the first flange 21. The width
of the first slit 17b in an extending direction of the side S1 of
the first flange 21 where the portion 21e is provided is smaller
than the width of the through-hole 17a. In the second lead wire
engaging portion 19, the second through-hole 19a is an elliptical
hole in shape with its major axis extending in parallel with an
extending direction of the side S2 of the second flange 23. The
width of the second slit 19b in the extending direction of the side
S2 of the second flange 23 is smaller than the width of the major
axis of the second through-hole 19a. In the third lead wire
engaging portion 27, the third through-hole 27a is an elliptical
hole with its major axis extending in parallel with the extending
direction of the side S1 of the first flange 21. The width of the
third slit 27b in the extending direction of the side S1 of the
first flange 21 is smaller than the width of the major axis of the
third through-hole 27a. Configurations of the first, second and
third through-holes 17a, 19a and 27a are not limited to those
employed in the present embodiment, and may arbitrarily be
determined as long as the lead wires 15 may not readily come off
from the slits 17b, 19b and 27b.
With such configuration of the first lead wire engaging portion 17,
the second lead wire engaging portion and the third lead wire
engaging portion 27, the plurality of lead wires 15 may be engaged
with the first lead wire engaging portion 17, the second lead wire
engaging portion 19, and the third wire engaging portion 27 merely
by inserting the plurality of lead wires 15 through the first slit
17b, the second slit 19b and the third slit 27b into the first
through-hole 17a, the second through-hole 19a and the third
through-hole 27a respectively. Thus engagement of the plurality of
lead wires 15 may be simplified. Further, once the lead wires 15
have been engaged with the engaging portions, that is, the lead
wires 15 have been inserted within the first to third through-holes
17a, 19a, 27a, the lead wires 15 may securely be engaged with the
first to third lead wire engaging portions 17, 19, 27 since the
lead wires 15 do not readily come off from the first to third slits
17b, 19b, 27b.
FIGS. 6 and 7 explain engagement of the plurality of lead wires 15
in the axial flow fan 1 according to the present embodiment. In
respect of engagement of the lead wires 15 with the second lead
wire engaging portion 19 as shown in FIGS. 6(A) and 6(B), the
plurality of lead wires 15 received in the groove portion 13 of the
web 11d are inserted through the slit 17b into the first
through-hole 17a. Thus the plurality of lead wires 15 are pulled
out into the outer space OS while being engaged with the first lead
wire engaging portion 17. Next, the plurality of lead wires 15
pulled out into the outer space OS are inserted through the second
slit 19b into the second through-hole 19a. Thus the plurality of
lead wires 15 are engaged with the second lead wire engaging
portion 19 while being engaged with the first lead wire engaging
portion 17. As a result, the plurality of lead wires 15 are pulled
out in the axial direction toward a side where the suction port or
the suction opening 24 is positioned, and then into a space outside
the axial flow fan 1.
In respect of engagement of the lead wires 15 with the third lead
wire engaging portion 27 as shown in FIGS. 7(A) and 7(B), the
process is similar to that of FIG. 6 until the wires have been
engaged with the first lead wire engaging portion 17 and pulled out
into the outer space OS. Then, the plurality of lead wires 15
pulled out into the outer space OS are inserted through the third
slit 27b into the third through-hole 27a. In this manner, the
plurality of lead wires 15 are engaged with the third lead wire
engaging portion 27 while being engaged with the first lead wire
engaging portion 17 and thereafter pulled out in the axial
direction toward a space outside the discharge port or the
discharge opening 22 of the axial flow fan 1.
The engagement of the lead wires 15 is not limited to those shown
in FIGS. 6 and 7, and it is a matter of course that the plurality
of lead wires 15 may be engaged with the second lead wire engaging
portion 19 and the third lead wire engaging portion 27. That is,
the plurality of lead wires 15 may be divided and separately pulled
out in the axial direction toward both sides where the suction port
is positioned and the discharge port is positioned.
INDUSTRIAL APPLICABILITY
According to the present invention, a third lead wire engaging
portion is provided in the first flange at a given distance from
the first lead wire engaging portion so that a plurality of lead
wires pulled out into an outer space between the first flange and
the second flange may be engaged with the third lead wire engaging
portion and then pulled out toward one side in the axial direction
where the first flange is positioned. Accordingly, the lead wires
may be pulled out not only to a side where the second flange is
positioned but also to a side where the first flange is positioned.
Thus, there are many options available how to install or place an
axial flow fan and how to guide the lead wires.
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